@keyframes hinge {
    0% {
        transform-origin: top left;
        animation-timing-function: ease-in-out;
    }

    20%, 60% {
        transform: rotate3d(0, 0, 1, 80deg);
        transform-origin: top left;
        animation-timing-function: ease-in-out;
    }

    40%, 80% {
        transform: rotate3d(0, 0, 1, 60deg);
        transform-origin: top left;
        animation-timing-function: ease-in-out;
        opacity: 1;
    }

    to {
        transform: translate3d(0, 700px, 0);
        opacity: 0;
    }
}

.hinge {
    animation-name: hinge;
}
